A SwiftUI example of an alert window that would be easy to implement using AutoLayout. This implementation uses onSizeChange from FrameUp https://github.com/ryanlintott/FrameUp

AutoLayoutTestApp.swift

//
//  AutoLayoutTestApp.swift
//  AutoLayoutTest
//
//  Created by Ryan Lintott on 2024-03-07.
//

import FrameUp
import SwiftUI

@main
struct AutoLayoutTestApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .windowResizability(.contentSize)
    }
}

struct ContentView: View {
    let alertText =
"""
Layouts like this are quite simple with AutoLayout and are also possible in SwiftUI.
This is one of the reasons I made FrameUp. I think SwiftUI is production ready. Actually, I think it will make UIs better and more flexible for things beyond specific AutoLayout examples that are a bit tricky to implement.
"""
    
    @State private var maxButtonWidth: CGFloat? = nil
    @State private var height: CGFloat? = nil
    
    var body: some View {
        VStack(alignment: .leading, spacing: 12) {
            HStack(alignment: .top) {
                Image(systemName: "exclamationmark.triangle.fill")
                    .resizable()
                    .scaledToFit()
                    .symbolRenderingMode(.multicolor)
                    .frame(height: 60)
                    .padding(4)
                
                VStack(alignment: .leading, spacing: 12) {
                    Text("Simple with FrameUp for SwiftUI")
                        .font(.headline)
                    Text(alertText)
                }
            }
            
            HStack {
                Button {
                    
                } label: {
                    Text("Lots of text here.")
                        .fixedSize()
                        .onSizeChange { size in
                            maxButtonWidth = max(maxButtonWidth ?? .zero, size.width)
                        }
                        .frame(maxWidth: maxButtonWidth)
                }
                    
                Spacer()
                
                Button {
                    
                } label: {
                    Text("Cancel")
                        .fixedSize()
                        .onSizeChange { size in
                            maxButtonWidth = max(maxButtonWidth ?? .zero, size.width)
                        }
                        .frame(maxWidth: maxButtonWidth)
                }
                
                Button {
                    
                } label: {
                    Text("OK")
                        .fixedSize()
                        .onSizeChange { size in
                            maxButtonWidth = max(maxButtonWidth ?? .zero, size.width)
                        }
                        .frame(minWidth: .zero, maxWidth: maxButtonWidth)
                }
            }
        }
        .padding(24)
        .background {
            Color.clear
                .onSizeChange { size in
                    height = size.height
                }
        }
        .fixedSize(horizontal: false, vertical: true)
        .frame(minWidth: 300)
        .frame(height: height)
    }
}

#Preview {
    ContentView()
}